Engine



H. H. TIMIAN Aug. 20, 1935.

ENGINE Filed June 24; 1932 INVENTOR. 3%) 070 if Fm'azz ATTORNEY.

-ize the fpre's sure in said a Patented Aug. 20, 1935 I 9 Claims. This invention relates to multi-cylinder internal combustion engines and more particularly pertains tojthe fuel mixture intake manifold structure thereforlln this type'of engine it is customaryto construct the intake manifold with a numberof branches, each branch being adapt-ed 'fo'r distributing, a fuel mixture to one or more engine cylinders. v a "{I-Ieretofore,':intake.manifolds of the aforesaid type havebeen' constructed with branches having -substantia1ly uniform cross section area. a This iconstruction is found to be unsatisfactory in that someiof' the branches'are subject to a relatively slower pressure recovery than others-during the 15 operation of the engine, thereby producing uneven engine operation. I have particularly notedthat the shorter branches have aslower pressure recovery than the longer branches of a standard m'anifold." Y a r 3 An object of myinvention is toeliininate the aforesaid difficulties by providing a manifold "structure having branches proportioned to equal-'- :engine operation.-

25 .Another object ofm y invention is to provide for fasmoother engine operation by providing a mani- 7 fold; structure :therefor in which the shorter branches, are enlarged in cross sectional area preferably at the bend whereby to speed up the pressure recovery insaidfshorter branches to thereby substantially equalize the pressures in themanifoldduring the engine operation.-

'. .f n "further object of my invention is to improve fuel flow in the relatively shorter branches anflfintake manifold; structure by providing a 'For 'fa more detailed understandingof my in vention, reference maybehad to the accompany.-

"1 ing drawing which illustrates one form which my 4 I Fig.2 isa plan viewof the intake manifold,

. Fig. 3 is a detail sectional view taken substantially on the line 3-3 of Fig. 1, and

Fig.4 is a detailtransverse sectional view of the enlarged porton of the short branches taken substantially on the line 34 of Fig. 3.

I have chosen for the purpose of illustration to show an engine having in general a cylinder block l0, cylinder Ill acylinder head I! secured to the block and an exhaust manifold l2 adapted to conduct the burnt gases from the cylinders manifold during the r arem-wh ch the'shorter branches are env JIarged in cross sectional area' at the bend.

ENGINE Harold H. .Timian, Detroit, Mich, assignor to Continental Motors Corporation, Detroit, Mich., a corporation of Virginia Application June 24, 1932, Serial No. 619,071

and for preheating the primary intake passage l 3 by conducting at least'some of the exhaustfgas'e's through the jackets or passages M,- An intake manifold having a plurality of short and long branches l5 and i6 respectively is cooperatively associated with the engine and is adapted-for conducting a fuel mixture to one or more en gine cylinders, the primary passage l3 connecting said branches with the fuel mixing forming device or carburetor l1. v

The long branches l6 forming a portion of the intake manifold structure are preferably "constructed with a uniform cross section over the entire length, and the relatively shorter branches cross section. Preferably, the shorter branches stares earner OFFICE l5 are enlarged at the bend I8 with respect to the remaining portion of the branches.

branches l5 taper off into a smaller cross'sectio-nal area as at l9 terminating in outletsZD connected with the engine cylinders, said outlets having a cross-sectional "area substantially equal to the cross-sectional area of the branches ahead of the bend (see Figs. 3 and 4).

short branches thereby giving animproved en- 'gine performance. i a

The principles of my invention will be ther apparent from the following. The ramming effect of the fuel mixture or the so-called .ve-

t ma be noted that the enlarged portion of each of said locity head, in a straight section of manifold tion. The inertia of the gas column mass, which produces this ramming efiect, drives the fuel mixture around the manifold bends and the longer the length of the straight section approaching the bend, the greater is this ramming effect. In a relatively short length of straight section, as provided by branches I5 in contrast with branches i6, there is much less of this ramming effect and therefore there isrelatively more difficulty in getting the fuel mixture around the bends l8 of-branches I5. By reason of my invention, I have opened up the bends or branches IE to permit the fuel mixture to flow around the bend with less restriction than would be experienced with a uniform cross-sectional area.

, 'stantially balance the pressure-drop 'between cor Thei bressure recovering vqualities provided by emy manifold reside in' the ability of ,the manifold branches to respond more readily and univ ,formly to varying pressurescaused by the engine performance 1 .As a further explanation of the "pressure'floui iatsthe'manifold bends, I'havev discovered that," for short branches where the'ramming fefiect is small asj-gin thej'casejof branches -l5 ,;the pressure 10 fore and after a conventional bend having uniform-eiosS-sectiOnal area. =Whe're this bend has its cross-sectional areaincreased, as providedh byh my invention, the pressure drop between, the

aforesaid points isexc'eedingl-y' low so astosubresponding'points for the bends of branches l6.

' It is undesirable to form thebendsof branches-- I6 =with theienlarged cross-sectional area shown at IB'for the branches l5; since to do so ld .inaterially hincrease the pressure beyond "riches; "with respeeti'tojthefpres- "new dfth bend s I'SQan'd furthermorelsuch' 11 tratedflin this drawine An intake inanifo 7 filam nt "i'xture fforr ning devicaa afy 'fu "conducting means; alplu hes o unequal lengthc'onununica n with said 15nrna'rybonducting means: and adapted lf orfcofnduc'ting a inixture to the en- "gine oyliildelirs, isaidz branches of arrelatively; l h. Winen, s e fi iime porl; equalizing qthe epressures within said i mamr m. i a L2, in fuel :.r'1'fi:'{tur onauctm dev1e5m a mum-winder n'gin ncluding fa primary con? 7 gueungmeans, fa blurali'tyof fuel mixturecon ductingbiancheibo i uincatingtherewith; some famili s bingl'substantially shorter than e '3. A{fu'el friiiitur conducting -device fora'inulti', 7 cylinder engine includinga prfii fy Conducting "'plu'i l't ".Io'f conducting branches 'of e u'ne :e' ing said nieans with the eng-in s. or qualizing' the working pressure nchesfandniclu-ding'an enfalls off ver'j in'aterially between points justbev H engine and including, aipluralijty of ntion and have dee V than those branchpontionsiadjacent'tgsa V {for a Inulti-cylinder .havinga,bend, said :shorter branches fthe' jibressfiir'es jiivithinifsaidl, conducting ,iiaiage bend in .a -po1.tio'ne of one oi. said relatively ALA ifuel, conducting structurefor. a multi-- cylinder engine, fuel-mixture conducting means including-afprimary conducting, portion and a pluralityj of fuel mixture conducting branch jportions for'conductingl a fuel mixtureto the engine cylinders, said branches arrangedin pair's,

; one pair of said branches, being shorter than the otherlpair and provided withan enlarged bend :pertien whereby to equalize the p es sures in said conducting means and to facilitate fuel m ixture flow saidfuel mixture conducting branches.

I i BQA fuel conducting structure for an engine including a plurality of fueliconducting. branches Wherebyto'conduct a fuel mixture-to said engine and 'eachhaV-ing a bend, a primary conducting means 'adabt'ed to cooperateiwith said branches, 3. 7

fuel device cooperating with said primary conducting means, a'pair'f of said" branches being relatively short, and; positioned adjacent the prima-1 y conducting means, said'short, branches provided with: an enlarged portion at the bendi thereto to facilitate, thei fuelrni'ii'tui nee/therein. i

an" manifold structure for a .irnulti- 1'" conducting fue1= mixture to the "engnielciflindei's;

mvmg a cross-sectional ma atth bender-eater bend 7; A mam-ma gardener iingier 3 greater than th ergildflgel vtif sidgblfanchesiall;i-

' said branches being a different length {and each 7 e hai ing a-bend, thesh'oiten of i-sam. breathes engine and mendingapmraiftyiqf braneh'es for conducting lfuel ,m'ix tureto the engine oylir-ldens.

I aiil i n hei 61 5 fl ml h :a di ach hfi y 'f a bend, the shorter lot ,saidjbranches having a-cross seotional area at the-bendfieater thanthe area of 'the'branch outlet and greater than the" crossrsectional areaj of said" longer braneh" at the bend'. I

- 3. A manifold structure 'jnulti-enlinder engine and including a pluraHty-ef'branehesfor' conducting fuel mixture to the engine :cyliix'ders, said branches being aj difieren't length; the

shorter of said branchesmrdvidedwitha bend .and having a cross-sectional area at the greater than the "area of 'the branch outlet, He

branch :poition intermediate the bend f'an'd b" smaller enact a;

9. A naniifold st said branchesbeingaidifieifentlengthflhe sHo e'r of "said branches provided a beiidi'afid d '.tg eatei: than a cross-sectional ara at ,the those branch portion 216 ta ered; a v a HAROLD v tb'ranch pbrtions adjaeeritthebend beingi wardly to r 

